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And when I query "status" from v$backup, all the data files show "not active"... as in:

SQL> select status from v$backup;

STATUS
------------------
NOT ACTIVE
NOT ACTIVE
NOT ACTIVE
NOT ACTIVE
NOT ACTIVE
NOT ACTIVE
NOT ACTIVE
NOT ACTIVE

That makes sense, BUT!!!!
When you put all the tablespaces in backup mode, including SYSTEM... the command for TOOLS still fails, but when you query v$backup... you find that the "status" for all data files are "ACTIVE"... as in: